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Modal Auxiliary Verbs
shall / will / can / could / would / should / may / might / must / need (n’t) / ought (not) to /
Modal auxiliary verbs differ from main verbs in two ways. The first difference is that they cannot stand alone but must be used in conjunction with a full verb. This function is exemplified in the name “Auxiliary” meaning to help or assist. The second difference of modal auxiliary verbs is to do with their function as “Mode changers” Hence the name “Modal”
To understand modality more clearly consider the following examples:
Come to dinner. (This sentence is an imperative and acts as an order)
Can you come to dinner? (The use of can here is linked to ability rephrased: Are you able to come to dinner. Remember come is the full verb can is the modal auxiliary verb.)
Will you come to dinner? (The use of will here is linked to intention. Rephrased do you intend to come to dinner?)
You ought to come to dinner? (The use of ought to here is being used to express the speakers belief that s/he thinks X is a good idea.)